function xcomFn = comFn(x)
xcomFn = (-12759122123*sin(x(1)) - 14065902578*sin(x(1) + x(2)) -  ...
  7707915000*sin(x(1) + x(2) + x(3)) +  ...
  1637194622*sin(x(1) + x(2) + x(3) - x(4)) +  ...
  457593477*sin(x(1) + x(2) + x(3) - x(4) - x(5)))/34726000000 ...
;